// 头部图片轮播
;(function(){
    var $headerul = $('#headerul'),
        $headerulli =  $('#headerul li'),
        headerulliHeight = $headerulli.height();
    setInterval(function(){
        $headerul.animate({marginTop:-headerulliHeight},3000,'swing',function(){
            $('#headerul').append($('#headerul li:first')).css('margin-top',0)
        })
    },3000)
}())